QPushButton {
    background-color: #FFB900;
    border-style: solid;
    border-width: 2px;
    border-color: #FF6F00;
    border-radius: 20px;
    font-size: 28px;
    font-family: KaiTi;
    font-weight: bold;
    color: #FFFFFF;
}

QPushButton#button_stop {
    background-color: #D50000;
    border-color: #B71C1C;
}

QPushButton#button_pause {
    background-color: #3F51B5;
    border-color: #1A237E;
}

QPushButton#button_next {
    background-color: #4CAF50;
    border-color: #1B5E20;
}

QPushButton#button_Variablespeed {
    background-color: #FF9800;
    border-color: #EF6C00;
}

QPushButton#button_previous {
    background-color: #9C27B0;
    border-color: #4A148C;
}
